Stock Plans (Details Textual) - USD ($) |
3 Months Ended | |
|---|---|---|
Mar. 31, 2016 |
Mar. 31, 2015 |
|
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||
| Weighted-average period for recognizing non-vested stock option | 1 year 7 months 6 days | |
| Employee Stock Option [Member] | ||
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||
| Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Total | $ 1,245,000 | |
| Award [Member] | ||
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||
| Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross | 168,000 | 250,000 |